WO2008138014A1 - Système de distribution de gaz respiratoire comprenant un élément filtrant pour le gaz évacué et procédé d'utilisation d'un système de distribution de gaz respiratoire - Google Patents

Système de distribution de gaz respiratoire comprenant un élément filtrant pour le gaz évacué et procédé d'utilisation d'un système de distribution de gaz respiratoire Download PDF

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Publication number
WO2008138014A1
WO2008138014A1 PCT/US2008/063127 US2008063127W WO2008138014A1 WO 2008138014 A1 WO2008138014 A1 WO 2008138014A1 US 2008063127 W US2008063127 W US 2008063127W WO 2008138014 A1 WO2008138014 A1 WO 2008138014A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
patient
exhaust
breathing
respirator
Prior art date
Application number
PCT/US2008/063127
Other languages
English (en)
Inventor
Bradley P. Fuhrman
Mark Dowhy
Original Assignee
The Research Foundation Of State University Of New York
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by The Research Foundation Of State University Of New York filed Critical The Research Foundation Of State University Of New York
Priority to EP08747871A priority Critical patent/EP2150302A1/fr
Priority to AU2008248330A priority patent/AU2008248330B2/en
Priority to CA002686657A priority patent/CA2686657A1/fr
Publication of WO2008138014A1 publication Critical patent/WO2008138014A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0045—Means for re-breathing exhaled gases, e.g. for hyperventilation treatment
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0087—Environmental safety or protection means, e.g. preventing explosion
    • A61M16/009—Removing used or expired gases or anaesthetic vapours
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0087—Environmental safety or protection means, e.g. preventing explosion
    • A61M16/009—Removing used or expired gases or anaesthetic vapours
    • A61M16/0093—Removing used or expired gases or anaesthetic vapours by adsorption, absorption or filtration
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/105—Filters
    • A61M16/1055—Filters bacterial
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/22—Carbon dioxide-absorbing devices ; Other means for removing carbon dioxide

Definitions

  • the present invention relates to patient ventilators, including re-breathing devices.
  • the present invention may be embodied as a scavenger system associated with a patient ventilator, which may be used to administer a therapeutic agent in gas or particulate form.
  • a patient ventilator is a device that moves air into and out of a patient's lungs.
  • a re-breathing system may be associated with a ventilator, and used to allow a patient to inhale gas that was previously exhaled. Such systems are particularly useful when the inhalation gas includes a therapeutic agent.
  • mechanisms must be provided in such systems to allow re-breathing gas to leave the system, either to make room for new gas or to protect against overpressuring a patient's lungs.
  • Rebreathing gas that exits the system may be harmful or dangerous to people, such as medical workers, near the system.
  • the invention may be embodied as a patient ventilator system having a housing with a gas exhaust orifice and a filter body.
  • the filter body may have (a) an inlet connected to the gas exhaust orifice, (b) an outlet connected to a suction line, (c) a major- through-passage for carrying exhaust gas from the gas exhaust orifice to the suction line, which may be accomplished without crossing a porous barrier of the filter body, and wherein the filter body is capable of passing gas from outside the ventilator across the porous barrier to the major-through-passage.
  • the filter body is tubular and the major through-passage is formed at least in part by the porous barrier.
  • the filter body includes a first channel, a second channel and a third channel, and (a) the first channel may be connected to receive exhaust gas from the gas exhaust orifice, (b) a porous body, may be attached to the second channel, (c) the first channel merges with the second channel at a merger location, and (d) the third channel may extend from the merger location to a waste line.
  • the invention may be embodied as a breathing-gas delivery system designed for re-breathing.
  • a breathing-gas delivery system designed for re-breathing.
  • the housing is disposed about the movable partition, and thereby provides a respirator side on a first side of the partition, and a patient side on a second side of the partition.
  • the housing also has (a) a patient inspiration orifice on the patient side, which is adaptable to supply breathing-gas to a patient, and (b) a gas exhaust orifice on the patient side.
  • the tubular filter may have (a) an inlet connected to the gas exhaust orifice,
  • a rebreathing system may utilize a filter body that includes a first channel, a second channel and a third channel.
  • the first channel may be connected to receive exhaust gas from the gas exhaust orifice, (b) a filter, which may be a porous body, may be attached to the second channel, (c) the first channel merges with the second channel at a merger location, and (d) the third channel may extend from the merger location to a waste line.
  • a filter which may be a porous body
  • a valve may be positioned to regulate flow of exhaust gas through the major- through-passage of the filter body.
  • the valve may allow exhaust gas to flow through the major-through-passage and hence out of the patient side of the housing when the pressure on the patient side of the housing exceeds the pressure on the respirator side of the housing.
  • the valve may be used to prevent exhaust gas from flowing through the major-through-passage when the pressure on the patient side of the housing is less-than the pressure on the respirator side of the housing.
  • the valve may be a control valve arranged to selectively inhibit the flow of exhaust gas if a pressure difference between the respirator side and the patient side is not within a range of acceptable pressures.
  • Other means may be provided to open and close this valve in such a way that exhaust occurs only during a desired portion of exhalation.
  • a system according to the invention may include an exhaust gas filter positioned to filter materials carried by the exhaust gas.
  • the exhaust gas filter may be positioned between the gas exhaust orifice and the tubular filter inlet, or may be positioned to filter exhaust gas that has passed through the major-through-passage of the filter body.
  • the invention may be embodied as a method of delivering breathing-gas.
  • a breathing-gas delivery system is provided.
  • the system may be like that described above.
  • the partition may be moved in order to cause inspiratory gas to leave the patient side via the patient inspiration orifice to supply breathing-gas to a patient.
  • the partition may also be moved in order to allow the patient side of the housing to receive exhaled gas from the patient. If the pressure on the patient side is not at a desirable level, then gas may be allowed to leave the patient side via the gas exhaust orifice, thereby providing exhaust gas to the filter body.
  • the exhaust gas may be passed through the major- through-passage.
  • gas from outside the system may be passed through a filter to the major- through-passage.
  • the exhaust gas may be passed through a gas exhaust filter before entering a suction line, or other waste disposal line that is suitable for handling exhaust gas.
  • Movement of the partition may be effected by a respirator that is in pneumatic communication with the respirator side of the housing. Movement of the partition during inhalation may be effected by increasing the pressure on the respirator side, and movement of the partition during exhalation may be effected by decreasing the pressure on the respirator side.
  • Figure l is a schematic of a system according to the invention.
  • Figure 2A depicts a valve in the open position
  • Figure 2B depicts a valve in the closed position
  • Figure 3 depicts a filter body having an exhaust gas filter
  • Figure 4 depicts a cross-sectional view of the filter body, taken along the line 4—4 of Figure 3;
  • Figure 5 depicts an end view of the exhaust gas filter shown in Figure 3;
  • Figure 6 is a flow diagram of a method according to the invention; and
  • Figure 7 depicts another type of filter that may be used in the invention. Further Description of the Invention
  • FIG. 1 is a schematic of a system 10 according to the invention.
  • a housing 13 and a movable partition 16 The housing 13 is disposed about the movable partition 16, and the movable partition 16 divides the housing 13 into a respirator side 19 on a first side of the partition 16, and a patient side 22 on a second side of the partition 16.
  • the housing 13 has a patient inspiration orifice 25 on the patient side 22, which may be adaptable to supply breathing-gas to a patient 28.
  • the housing 13 may also have a patient return orifice 31 , which may operate in conjunction with the patient inspiration orifice 25 to convey patient side 22 gas to and from the patient 28, thereby facilitating inhalation and exhalation.
  • the partition 16 may be moved in order to facilitate inhalation and exhalation by the patient 28.
  • the system 10 may be arranged to be especially well suited for delivering respiratory gases to and from a patient 28 while allowing rebreathing of gas on the patient side 22. Rebreathing may be beneficial in order to provide a proper dose of a medicament to the patient 28 and/or to conserve medicaments, particularly when the medicament is costly.
  • the housing 13 may be equipped with a respirator orifice 34 on the respirator side 19.
  • the respirator orifice 34 may be in pneumatic communication with a respirator 37, and the respirator 37 may control the pressure on the respirator side 19 of the housing 13 in order to control when and how gas from the patient side 22 is delivered to and/or taken from the patient 28.
  • the respirator 37 may cause the movable partition 16 to move toward the patient 28, thereby causing gas to leave the patient side 22 via the patient inspiration orifice 25 in order to supply breathing gas to the patient 28.
  • the respirator 37 may cause the movable partition 16 to move away from the patient 28, thereby causing gas to enter the patient side 22 via a return orifice 31 in order to accept exhaled gas from the patient 28.
  • Check valves 40 may be included in the system 10 in order to assure that inhaled gas and exhaled gas are properly conveyed to and from the patient side 22 of the housing 13.
  • a CO 2 scrubber 43 may be included to remove CO 2 from gas on the patient side 22 of the housing 13.
  • the housing 13 also has a gas exhaust orifice 46 on the patient side 22.
  • the system 10 shown in Figure 1 has a tubular filter body 49 having an inlet 52 connected to the gas exhaust orifice 46.
  • the tubular filter body 49 may be a cylindrical tube, or may be another shape, including standard shapes such as a square, oval, or triangle.
  • the tubular filter body 49 also has an outlet 55 connected to a suction line 58.
  • the suction line 58 may be a vacuum line, which is commonly found in most hospitals.
  • the filter material of the tubular filter body 49 provides a porous barrier 61 that is disposed away from a central axis 64 of the tubular filter body 49 in order to form a major-through-passage 67 for carrying exhaust gas from the gas exhaust orifice 46 to the suction line 58 without crossing the porous barrier 61 of the tubular filter body 49.
  • the porous barrier 61 of the tubular filter body 49 is able to pass gas from outside the rebreather system 10 across the filter 49 to the major-through-passage 67, and thereby prevent harmful liquid or solid particulate substances in the exhaust gas from leaving the system 10 via the tubular filter body 49.
  • the suction line 58 supplies a pressure that is below the pressure of the gas outside the system 10, gas from outside the system 10 will cross the porous barrier 61 and ultimately enter the suction line 58.
  • the suction line 58 supplies a pressure of -30 centimeters of water, and in that situation it is believed the porous barrier 61 may acceptably have a pressure drop of up to one centimeter of water, but preferably should be less than 0.5 centimeters of water.
  • gas from the patient side 22 may be exhausted from the patient side 22 via the gas exhaust orifice 46, and then may be supplied to the suction line 58 after passing through the major-through-passage 67.
  • exhaust gas When exhaust gas is moved from the patient side 22 into the major-through-passage 67, the exhaust gas will be mixed with gas that has crossed the porous barrier 61 of the tubular filter body 49 from outside the system 10. The mixed gas will then proceed to the suction line 58.
  • the porous barrier 61 may be a HEPA filter and/or the flow rate of gas crossing from outside the system 10 into the major-through-passage 67 may be kept sufficiently high.
  • the pressure drop across the porous barrier 61 of the tubular filter body 49 should be minimal so that inflow of gas across the porous barrier 61 of the tubular filter body 49 will prevent pressure within the major-through-passage 67 of the tubular filter body 49 from becoming negative.
  • the amount of gas crossing the porous barrier 61 from outside the system 10 may vary depending on the amount of exhaust gas flowing into the tubular filter body 49. This should allow the exhaust system 10 to remove virtually all gas exhausted from the patient side 22.
  • an exhaust line 70 is shown in Figure 1 connecting the gas exhaust orifice 46 of the housing 13 with the tubular filter inlet 52.
  • a valve 73 may be positioned in the exhaust line 70 to regulate timing or flow of exhaust gas through the major-through-passage 67 of the tubular filter body 49.
  • the valve 73 may operate to allow exhaust gas to flow through the major-through-passage 67 of the tubular filter body 49 when the pressure on the patient side 22 of the housing 13 exceeds the pressure on the respirator side 19 of the housing 13, and/or the valve 73 may serve to prevent exhaust gas from flowing through the major- through-passage 67 of the tubular filter body 49 when the pressure on the patient side 22 of the housing 13 is less-than the pressure on the respirator side 19 of the housing 13.
  • valve 73 is configured to both (a) allow exhaust gas to flow through the major-through- passage 67 when the pressure on the patient side 22 exceeds the pressure on the respirator side 19, and (b) prevent exhaust gas from flowing through the major-through-passage 67 of the tubular filter body 49 when the pressure on the patient side 22 of the housing 13 is less- than the pressure on the respirator side 19 of the housing 13, then the valve 73 may serve to keep gas in the patient side 22 until the pressure on the patient side 22 exceeds the pressure on the respirator side 19, or some other desired pressure limit.
  • Figure 2 A and 2B depict one type of valve 73 that may be used in the system.
  • valve 73 In Figure 2A, the valve 73 is shown in the open position and in Figure 2B the valve 73 is shown in the closed position.
  • the valve 73 has an inlet tube 76, a diaphragm 79 and a pressure regulator conduit 82.
  • the inlet tube 76 receives gas from the patient side 22.
  • the diaphragm 79 In the open position (Fig. 2A), the diaphragm 79 does not cover an end 85 of the inlet tube 76.
  • gas In the open position, gas is allowed to flow from the patient side 22, through the inlet tube 76 and out the exit 88.
  • the closed position In the closed position, (Fig. 2B), the diaphragm 79 covers the end 85 of the inlet tube 76.
  • the diaphragm 79 may be moved between the open and closed positions by varying the pressure in the regulator conduit 82, which may be in pneumatic communication with the respirator side 19 of the housing 13, or by varying the pressure on the patient side 22, which is in communication with the inlet tube 76.
  • the valve 73 may be a control valve, which is capable of regulating the flow of exhaust gas through the major-through-passage 67 of the tubular filter body 49 in order to achieve a desired flow rate, or a desired pressure on the patient side 22, or both.
  • the control valve may be operated so as to variably inhibit the flow of exhaust gas if a pressure difference between the respirator side 19 and the patient side 22 is not within a range of acceptable pressures.
  • a system 10 according to the invention may include another filter.
  • Figure 5 shows a disc-shaped exhaust gas filter 91 that is positioned to filter exhaust gas.
  • the exhaust gas filter 91 may be shaped as a parallelepiped or a cone.
  • the exhaust gas filter 91 may be placed upstream of the tubular filter body 49.
  • the exhaust gas filter 91 may be positioned between the gas exhaust orifice 46 and the tubular filter inlet 52, and thereby filter the exhaust gas before it passes into the tubular filter body 49. In this position, the porous barrier 94 of the exhaust gas filter 91 may become laden with moisture, since the patient side 22 is expected to contain gas having a high moisture content.
  • the pressure drop across the exhaust gas filter 91 may be high enough to impact operation of the system 10 if the exhaust gas filter 91 is not sized properly. It is believed that the exhaust gas filter 91 may need to be sized to provide a pressure drop across the exhaust gas filter 91 that is not more than 5 centimeters of water, and preferably is less than 2 centimeters of water.
  • the exhaust gas filter 91 may be placed to filter exhaust gas that has passed through the major-through-passage 67 of the tubular filter body 49, for example downstream of the tubular filter body 49. If the exhaust gas filter 91 is located downstream of the tubular filter body 49, the porous barrier 94 of the exhaust gas filter 91 will filter not only exhaust gas from the patient side 22, but also gas from outside the system 10 that has crossed the porous barrier 61 of the tubular filter body 49. Therefore, when placed downstream of the tubular filter body 49, the exhaust gas filter 91 may need to be sized to handle more gas flow than when the exhaust gas filter 91 is placed upstream of the tubular filter body 49. It is believed that an average flow rate of at least five liters per minute may be needed to accommodate an average adult.
  • the housing 13 may include a bias flow inlet orifice 97 on the patient side 22 of the housing 13.
  • the bias flow inlet orifice 97 may be used to supply fresh gas or medicaments to the patient side 22 of the housing 13.
  • an inspiratory gas source 100 may provide oxygen via a controller 103 to the patient side 22.
  • a fresh gas source may provide a therapeutic gas, or a vaporizer or a nebulizer 106 may provide a therapeutic vapor or aerosol (herein therapeutic gasses, vapors and aerosols are included in the term "medicament") to the inspiratory gas.
  • the patient 28 may take the fresh gas and/or medicaments into his lungs.
  • Exhaled gas from the patient 28 may include oxygen and/or medicaments which can be rebreathed by the patient 28 using a system according to the invention. From time to time, it will be necessary to remove some of the gas in the patient side 22 in order to allow additional fresh gas and/or a dose of medicament to enter the patient 28. However, since the patient side 22 will include exhaled gas, the patient side 22 gas may also include harmful bacteria and/or viruses.
  • the exhaust gas filter 91 may be a HEPA filter sized to prevent small particulates, bacteria, and/or viruses from entering the suction line 58.
  • the porous barrier 94 of the exhaust gas filter 91 may be selected to capture particles of medicament that have not been taken up by the patient 28.
  • the invention may be embodied as a method of delivering breathing gas.
  • Figure 6 illustrates one such method.
  • a system like those described above, may be provided 200.
  • the partition may be moved 203 back and forth to facilitate moving gas into and out of the patient's lungs.
  • the partition may be moved toward the patient in order to cause inspiratory gas to leave the patient side via the patient inspiration orifice to supply breathing-gas to a patient.
  • the partition may also be moved away from the patient in order to allow the patient side of the housing to receive exhaled gas from the patient.
  • Movement of the partition may be effected by a respirator that is in pneumatic communication with the respirator side of the housing. Movement of the partition during inhalation may be caused by increasing the pressure on the respirator side, and movement of the partition during exhalation may be caused by decreasing the pressure on the respirator side.
  • gas may be allowed to leave 206 the patient side via the gas exhaust orifice, thereby providing exhaust gas to the major-through-passage.
  • gas may be allowed to leave the patient side via the gas exhaust orifice.
  • the gas leaving the patient side via the gas exhaust orifice (the "exhaust gas”) may be passed 209 through the major-through-passage.
  • the filter Before, during and after passing the exhaust gas through the major-through- passage, the filter may pass 212 gas from outside the rebreather across the porous barrier to the major-through-passage.
  • gas from outside the system will be passing through the major-through-passage any time exhaust gas is released via the gas exhaust orifice from the patient side of the housing.
  • the exhaust gas may also be passed through a gas exhaust filter before passing 215 into a suction line, or other disposal line that is suitable for handling and or disposing of the exhaust gas.
  • Figure 7 depicts another filter body.
  • a filter body in Figure 7 there is shown a filter body
  • the filter body 109 depicted in Figure 7 has (a) an inlet 112 that may be connected to the gas exhaust orifice 46, (b) an outlet 115 connected to the suction line 58, and (c) a major-through-passage 67 for carrying exhaust gas from the gas exhaust orifice 46 to the suction line 58 without crossing a porous barrier 118, through which gas from outside the system 10 is allowed to move before entering the major-through-passage 67.
  • the porous barrier 118 may be a disc-type porous barrier, similar to the exhaust gas filter 91.
  • the filter body 109 is capable of passing gas from outside the system across the porous barrier 118 of the filter body 109 to the major-through-passage 67.
  • the inlet 112 is shown in Figure 7 at the beginning of a first channel 121, which may be used to convey exhaust gas.
  • a second channel 124 also shown in Figure 7, may be used to convey gas from outside the system.
  • the porous barrier 118 is shown in the second channel 124.
  • a third channel 127 is shown extending from a merger location 130, where the first and second channels 121, 124 merge together.
  • the third channel 127 extends from the merger location 130 toward a waste line, such as a hospital suction line 58.
  • the third channel 127 may be used to convey gas from the first and/or second channels 121, 124 to the suction line 58.
  • a system 10 and method according to the invention may allow for (a) removing unwanted or excess gas from the patient side 22, which may carry a medicament and/or harmful substances, (b) preventing the pressure on the patient side 22 from becoming too high, and (c) protecting hospital personnel from infectious organisms that may be in the patient side 22.

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  • Health & Medical Sciences (AREA)
  • Anesthesiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Pulmonology (AREA)
  • Hematology (AREA)
  • Emergency Medicine (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Environmental & Geological Engineering (AREA)
  • Environmental Sciences (AREA)
  • Ecology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Abstract

L'invention concerne des systèmes et des procédés de distribution de gaz respiratoire. L'un des systèmes décrits comprend une cloison mobile, un boîtier, et un élément filtrant. Le boîtier est placé autour de la cloison mobile, formant ainsi un côté respirateur du premier côté de la cloison, et un côté patient du second côté de la cloison. Le boîtier comprend en outre (a) un orifice d'inspiration pour le patient du côté patient, qui peut être adapté pour l'apport d'un gaz respiratoire à un patient, et (b) un orifice d'évacuation de gaz du côté patient.
PCT/US2008/063127 2007-05-08 2008-05-08 Système de distribution de gaz respiratoire comprenant un élément filtrant pour le gaz évacué et procédé d'utilisation d'un système de distribution de gaz respiratoire WO2008138014A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP08747871A EP2150302A1 (fr) 2007-05-08 2008-05-08 Système de distribution de gaz respiratoire comprenant un élément filtrant pour le gaz évacué et procédé d'utilisation d'un système de distribution de gaz respiratoire
AU2008248330A AU2008248330B2 (en) 2007-05-08 2008-05-08 Breathing-gas delivery system with exhaust gas filter body and method of operating a breathing-gas delivery system
CA002686657A CA2686657A1 (fr) 2007-05-08 2008-05-08 Systeme de distribution de gaz respiratoire comprenant un element filtrant pour le gaz evacue et procede d'utilisation d'un systeme de distribution de gaz respiratoire

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US91666707P 2007-05-08 2007-05-08
US60/916,667 2007-05-08

Publications (1)

Publication Number Publication Date
WO2008138014A1 true WO2008138014A1 (fr) 2008-11-13

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Application Number Title Priority Date Filing Date
PCT/US2008/063127 WO2008138014A1 (fr) 2007-05-08 2008-05-08 Système de distribution de gaz respiratoire comprenant un élément filtrant pour le gaz évacué et procédé d'utilisation d'un système de distribution de gaz respiratoire

Country Status (5)

Country Link
US (1) US20080276940A1 (fr)
EP (1) EP2150302A1 (fr)
AU (1) AU2008248330B2 (fr)
CA (1) CA2686657A1 (fr)
WO (1) WO2008138014A1 (fr)

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EP3909629A1 (fr) * 2020-09-08 2021-11-17 ZeoSys Medical GmbH Système et procédé de filtration de gaz respiratoire ainsi que réservoir tampon pour un système de filtration de gaz respiratoire

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CN102056538B (zh) 2008-06-06 2014-10-15 柯惠有限合伙公司 用于在换气系统中确定患者努力及/或呼吸参数的系统及方法
US8714154B2 (en) 2011-03-30 2014-05-06 Covidien Lp Systems and methods for automatic adjustment of ventilator settings
US10362967B2 (en) 2012-07-09 2019-07-30 Covidien Lp Systems and methods for missed breath detection and indication
US9808591B2 (en) 2014-08-15 2017-11-07 Covidien Lp Methods and systems for breath delivery synchronization
US9950129B2 (en) 2014-10-27 2018-04-24 Covidien Lp Ventilation triggering using change-point detection
CN112118884A (zh) 2018-05-14 2020-12-22 柯惠有限合伙公司 用于利用信号失真的呼吸努力检测的系统和方法
US11752287B2 (en) 2018-10-03 2023-09-12 Covidien Lp Systems and methods for automatic cycling or cycling detection
US11173262B2 (en) * 2019-01-31 2021-11-16 Texas Tech University System Device and method to compensate for air leak from an anesthesia circle circuit

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CA2686657A1 (fr) 2008-11-13

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